Transmission device, transmission method, reception device, reception method, display device, and display method

ABSTRACT

A transmission device including circuitry is provided. The circuitry is configured to apply photoelectric conversion characteristics to high dynamic range video data to obtain transmission video data. The circuitry is configured to transmit a container including a video stream obtained by encoding the transmission video data. The circuitry is configured to insert type information to designate the type of conversion characteristics corresponding to the applied photoelectric conversion characteristics for photoelectric conversion of the transmission video data into a layer of the video stream and/or a layer of the container. The type of the conversion characteristics designated by the type information is determined regardless of luminance of a display.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. Ser. No. 16/743,852 filedJan. 15, 2020, which is a continuation of U.S. Ser. No. 16/666,133 filedOct. 28, 2019, which is a continuation of U.S. Ser. No. 16/231,371 filedDec. 21, 2018, which is a continuation of U.S. Ser. No. 15/111,056 filedJul. 12, 2016, which is now U.S. Pat. No. 10,313,709 issued Jun. 4,2019, the entire content of which are incorporated herein by reference.U.S. Ser. No. 15/111,056 is a national stage of PCT/JP2015/050703 filedJan. 13, 2015, and also claims priority under 35 U.S.C. 119 to JapaneseApplication No. 2014-022892 filed Feb. 7, 2014. The benefit of priorityis claimed to each of the foregoing, and the entire contents of each ofthe foregoing are incorporated herein by reference.

TECHNICAL FIELD

The present technology relates to a transmission device, a transmissionmethod, a reception device, a reception method, a display device, and adisplay method, and more particularly, for example, to a transmissiondevice capable of performing photoelectric conversion on video data of ahigh dynamic range, compressing a level range, and transmittingresulting data.

BACKGROUND ART

In the past, gamma correction of correcting a gamma characteristic of amonitor by receiving data having an opposite characteristic to acharacteristic of a monitor is known. For example, Non-Patent Document 1discloses a technique of transmitting a video stream generated byencoding transmission video data obtained by applying photoelectricconversion on high dynamic range (HDR) video data having a level of 0 to100%*N (N is larger than 1).

CITATION LIST Non-Patent Document

-   Non-Patent Document 1: High Efficiency Video Coding (HEVC) text    specification draft 10 (for FDIS & Last Call)

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

If a range having compatibility with a photoelectric conversioncharacteristic of the related art is increased, a range in which HDReffects are obtained is reduced. On the other hand, in photoelectricconversion characteristic applied to the HDR video data, if the range inwhich HDR effects are obtained is increased, the range havingcompatibility with a photoelectric conversion characteristic of therelated art is reduced. As described above, in the single photoelectricconversion characteristic, it is hard to satisfy compatibility with therelated art and abundant expression performance of the HDR at the sametime. Meanwhile, generally, a demand for a gradation of an HDR imagediffers according to each image.

It is an object of the present technology to provide a technique capableof performing appropriate photoelectric conversion on HDR video dataaccording to image content and transmitting resulting data.

Solutions to Problems

A concept of the present technology lies in

a transmission device, including:

a processing unit that performs photoelectric conversion on input videodata having a level range of 0% to 100%*N (N is a number larger than 1),and obtains transmission video data;

a transmission unit that transmits a container including a video streamobtained by encoding the transmission video data; and

an information insertion unit that inserts information of anelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data into a layer of the video stream and/or alayer of the container.

In the present technology, a processing unit performs photoelectricconversion on input video data having a level range of 0% to 100%*N (Nis a number larger than 1), and obtains transmission video data. Atransmission unit transmits a container including a video streamobtained by encoding the transmission video data. For example, thecontainer may be a transport stream (MPEG-2 TS) employed by a digitalbroadcasting standard. Further, for example, the container may be an MP4used in delivery via the Internet or the like or a container of anyother format.

An information insertion unit inserts information of an electro-opticalconversion characteristic of each predetermined unit of the transmissionvideo data into a layer of the video stream and/or a layer of thecontainer. For example, a predetermined unit may be a scene unit or aprogram unit. Further, for example, the electro-optical conversioncharacteristic information may be type information designating a type ofelectro-optical conversion characteristic. Further, for example, theelectro-optical conversion characteristic information may be a parameterfor obtaining a curve of the electro-optical conversion characteristic.

As described above, in the present technology, the information of theelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data is inserted into the layer of the videostream and/or the layer of the container. Thus, it is possible toperform the photoelectric conversion on the HDR video data inpredetermined units by selectively applying the appropriatephotoelectric conversion characteristic according to the image contentand transmit the resulting data.

Further, another concept of the present technology lies in

a reception device, including:

a reception unit that receives a container of a predetermined formatincluding a video stream obtained by encoding transmission video data,

the transmission video data being obtained by performing photoelectricconversion on input video data having a level range of 0% to 100%*N (Nis a number larger than 1),

information of an electro-optical conversion characteristic of eachpredetermined unit of the transmission video data being inserted into alayer of the video stream and/or a layer of the container; and

a processing unit that processes the video stream included in thecontainer received by the reception unit.

In the present technology, a reception unit receives a container of apredetermined format including a video stream obtained by encodingtransmission video data. The transmission video data is obtained byperforming photoelectric conversion on input video data having a levelrange of 0% to 100%*N (N is a number larger than 1). Further,information of an electro-optical conversion characteristic of eachpredetermined unit of the transmission video data is inserted into alayer of the video stream and/or a layer of the container. A processingunit processes the video stream included in the container received bythe reception unit.

For example, the processing unit may include a decoding unit thatdecodes the video stream and obtains the transmission video data and anelectro-optical conversion unit that performs electro-optical conversionon the transmission video data obtained by the decoding unit based oninformation of the electro-optical conversion characteristic of eachpredetermined unit, and obtains output video data. Thus, it is possibleto reproduce the HDR video data that does not undergo the photoelectricconversion at the transmission side and display the HDR imageexcellently.

In this case, for example, the electro-optical conversion characteristicinformation may be type information designating a type of theelectro-optical conversion characteristic, and the electro-opticalconversion unit may perform electro-optical conversion on thetransmission video data based on a curve of the electro-opticalconversion characteristic of the type designated by the typeinformation. Further, in this case, for example, the electro-opticalconversion characteristic information may be a parameter for obtaining acurve of the electro-optical conversion characteristic, and theelectro-optical conversion unit may perform electro-optical conversionon the transmission video data based on the curve of the electro-opticalconversion characteristic obtained by the parameter.

In this case, for example, the curve of the electro-optical conversioncharacteristic used by the electro-optical conversion unit may beobtained based on the parameter and maximum display level information,and a maximum level of the output video data may be limited to themaximum display level information. Thus, it is possible to display theHDR image excellently without incurring white collapse and the like inthe display unit (display).

Further, the processing unit may include a decoding unit that decodesthe video stream included in the container, and obtains the transmissionvideo data and a transmission unit that transmits the transmission videodata obtained by the decoding unit and the electro-optical conversioncharacteristic information of each predetermined unit of thetransmission video data to an external device in association with eachother. Thus, the external device can perform the electro-opticalconversion on the transmission video data based on the information ofthe electro-optical conversion characteristic of each predeterminedunit, reproduce the HDR video data that does not undergo theelectro-optical conversion at the transmission side, and excellentlydisplay the HDR image.

In this case, for example, the transmission unit may transmit thetransmission video data to the external device through a differentialsignal using a predetermined number of channels, and may insertinformation of the electro-optical conversion characteristic into ablanking period of the transmission video data and may transmit theelectro-optical conversion characteristic information to the externaldevice.

Further, another concept of the present technology lies in

a display device, including:

a reception unit that receives transmission video data and informationof an electro-optical conversion characteristic of each predeterminedunit of the transmission video data associated with the transmissionvideo data from an external device; and

an electro-optical conversion unit that performs electro-opticalconversion on the transmission video data received by the reception unitbased on the information of the electro-optical conversioncharacteristic of each predetermined unit, and obtains output videodata.

In the present technology, a reception unit receives transmission videodata and information of an electro-optical conversion characteristic ofeach predetermined unit of the transmission video data associated withthe transmission video data from an external device. An electro-opticalconversion unit performs electro-optical conversion on the transmissionvideo data received by the reception unit based on the information ofthe electro-optical conversion characteristic of each predeterminedunit, and obtains output video data. Thus, it is possible to reproducethe HDR video data that does not undergo the electro-optical conversionand excellently display the HDR image.

In this case, for example, the electro-optical conversion characteristicinformation may be type information designating a type of theelectro-optical conversion characteristic, and the electro-opticalconversion unit may perform electro-optical conversion on thetransmission video data based on a curve of the electro-opticalconversion characteristic of the type designated by the typeinformation. Further, in this case, for example, the electro-opticalconversion characteristic information may be a parameter for obtaining acurve of the electro-optical conversion characteristic, and theelectro-optical conversion unit may perform electro-optical conversionon the transmission video data based on the curve of the electro-opticalconversion characteristic obtained by the parameter.

In this case, for example, the curve of the electro-optical conversioncharacteristic used by the electro-optical conversion unit may beobtained based on the parameter and maximum display level information,and a maximum level of the output video data may be limited to themaximum display level information. Thus, it is possible to display theHDR image excellently without incurring white collapse and the like inthe display unit (display).

Further, another concept of the present technology lies in

a transmission device, including:

a first transmission unit that transmits a container including a videostream including encoded data of transmission video data obtained byperforming photoelectric conversion on input video data having a levelrange of 0% to 100%*N (N is a number larger than 1); and

a second transmission unit that transmits a metafile includinginformation for enabling a reception side to acquire the video stream,

wherein information of an electro-optical conversion characteristic ofeach predetermined unit of the transmission video data is inserted intothe video stream and/or the metafile.

In the present technology, a first transmission unit transmits acontainer including a video stream including encoded data oftransmission video data obtained by performing photoelectric conversionon input video data having a level range of 0% to 100%*N (N is a numberlarger than 1). A second transmission unit transmits a metafileincluding information for enabling a reception side to acquire the videostream. Further, information of an electro-optical conversioncharacteristic of each predetermined unit of the transmission video datais inserted into the video stream and/or the metafile.

As described above, in the present technology, the information of theelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data is inserted into the video stream and/or themetafile. Thus, it is possible to perform the photoelectric conversionon the HDR video data in predetermined units by selectively applying theappropriate photoelectric conversion characteristic according to theimage content and transmit the resulting data.

Further, another concept of the present technology lies in

a transmission device, including:

a transmission unit that transmits a container including a video streamincluding encoded data of transmission video data obtained by performingphotoelectric conversion on input video data having a level range of 0%to 100%*N (N is a number larger than 1),

wherein information of an electro-optical conversion characteristic ofeach predetermined unit of the transmission video data is inserted intoa layer of the video stream and/or a layer of the container.

Effects of the Invention

According to the present technology, it is possible to performappropriate photoelectric conversion on HDR video data according toimage content and transmit resulting data. The effect described hereinis merely an example and not limited, and an additional effect may beincluded.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram illustrating an exemplary configuration of atransceiving system.

FIG. 2 is a block diagram illustrating an exemplary configuration of atransmission device.

FIG. 3 is a diagram illustrating an example of photoelectric conversioncharacteristic.

FIG. 4 is a diagram illustrating a first access unit of a GOP when anencoding scheme is HEVC.

FIGS. 5(a) and 5(b) are diagrams illustrating an exemplary structure anHDR EOTF information SEI message.

FIG. 6 is a diagram illustrating an exemplary structure of “HDR_EOTFinformation_data( ).”

FIG. 7 is a diagram illustrating main content in an exemplary structureof “HDR_EOTF information_data( ).”

FIG. 8 is a diagram illustrating an exemplary structure of an HDRdescriptor.

FIG. 9 is a diagram illustrating an exemplary configuration of atransport stream.

FIG. 10 is a block diagram illustrating an exemplary configuration of aset top box.

FIG. 11 is a diagram illustrating an exemplary structure of a packet ofan HDMI Vendor Specific InfoFrame.

FIG. 12 is a diagram illustrating an exemplary structure of a packet ofan HDMI Vendor Specific InfoFrame.

FIG. 13 is a diagram illustrating an exemplary configuration of adisplay device.

FIG. 14 is a diagram illustrating an example of an electro-opticalconversion characteristic.

FIG. 15 is a diagram illustrating an example of an electro-opticalconversion characteristic.

FIG. 16 is a block diagram illustrating another exemplary configurationof a transceiving system.

FIG. 17 is a block diagram illustrating an exemplary configuration of areception device.

FIG. 18 is a block diagram illustrating an exemplary configuration of anMPEG-DASH-based transceiving system.

FIG. 19 is a diagram for describing a scheme that is newly defined.

FIG. 20 is a diagram illustrating an exemplary description of an MPDfile of electro-optical conversion characteristic information.

FIG. 21 is a diagram illustrating an exemplary configuration of afragmented MP4 stream.

FIG. 22 is a block diagram illustrating another exemplary configurationof an MPEG-DASH-based transceiving system.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, modes (hereinafter, referred to as “embodiments”) forcarrying out the invention will be described.

The description will proceed in the following order.

1. Embodiment

2. Modified example

1. EMBODIMENT

[Configuration of Transceiving System]

FIG. 1 illustrates an exemplary configuration of a transceiving system10 according to an embodiment. The transceiving system 10 includes atransmission device 100, a set top box (STB) 200, and a display device(monitor) 300. The set top box 200 and the display device 300 areconnected to each other via a high definition multimedia interface(HDMI) cable 400.

The transmission device 100 generates a transport stream TS of MPEG 2serving as a container and transmits the transport stream TS through abroadcast wave or a network packet. The transport stream TS includes avideo stream obtained by encoding transmission video data.

The transmission video data is obtained by selectively applying anappropriate photoelectric conversion characteristic to HDR video dataserving as input video data according to image content in predeterminedunits and performing photoelectric conversion. In this case, forexample, the input video data has a level range of 0% to N % (N>100),whereas the transmission video data has a level range of 0% to 100%.Here, a value of “%” is a relative value, for example, when 100 cd/m² isset as 100%. The predetermined unit is a scene unit, a program unit, orthe like.

The transmission device 100 inserts information of electro-opticalconversion characteristic of each predetermined unit of the transmissionvideo data into a layer of the video stream and/or a layer of thetransport stream (container). The electro-optical conversioncharacteristic is generally an inverse characteristic of thephotoelectric conversion characteristic but may not be necessarily aperfectly inverse characteristic. Here, the information of theelectro-optical conversion characteristic is, for example, typeinformation designating a type of electro-optical conversioncharacteristic, a parameter for obtaining a curve of the electro-opticalconversion characteristic, or the like.

The set top box 200 receives the transport stream TS that is transmittedthrough the broadcast wave or the network packet from the transmissiondevice 100. The transport stream TS includes the video stream obtainedby encoding the transmission video data. The set top box 200 performs adecoding process on the video stream, and acquires the transmissionvideo data.

The set top box 200 acquires the information of the electro-opticalconversion characteristic of each predetermined unit of the transmissionvideo data inserted into the layer of the video stream and/or the layerof the transport stream (container). The set top box 200 transmits thetransmission video data with the electro-optical conversioncharacteristic information to the display device 300 in association witheach other.

In this case, the set top box 200 transmits the transmission video dataand the electro-optical conversion characteristic information to thedisplay device 300 via the HDMI cable 400. In other words, the set topbox 200 transmits the transmission video data via a TMDS channel, andinserts the electro-optical conversion characteristic information, forexample, into a blanking period of the transmission video data and thentransmits the resulting transmission video data.

The display device 300 receives the transmission video data and theelectro-optical conversion characteristic information which istransmitted from the set top box 200 via the HDMI cable 400. The displaydevice 300 obtains output video data by performing the electro-opticalconversion on the transmission video data based on the information ofthe electro-optical conversion characteristic of each predeterminedunit. Then, the display device 300 displays an HDR image based on theoutput video data through a display unit (a display).

In this case, when the electro-optical conversion characteristicinformation is the type information, the display device 300 performs theelectro-optical conversion on the transmission video data based on thecurve of the electro-optical conversion characteristic of the typedesignated by the type information. In this case, when theelectro-optical conversion characteristic information is the parameterfor obtaining the curve of the electro-optical conversioncharacteristic, the display device 300 performs the electro-opticalconversion on the transmission video data based on the curve of theelectro-optical conversion characteristic obtained by the parameter. Inthis case, for example, by obtaining it based on the parameter andmaximum display level information, it is possible to limit the maximumlevel of the output video data to the maximum display level information.

[Configuration of Transmission Device]

FIG. 2 illustrates an exemplary configuration of the transmission device100. The transmission device 100 includes a control unit 101, a camera102, a photoelectric conversion unit 103, a video encoder 104, a systemencoder 105, and a transmission unit 106. The control unit 101 isequipped with a central processing unit (CPU), and controls operationsof the respective units of the transmission device 100 based on acontrol program stored in a storage (not illustrated).

The camera 102 images a subject, and outputs video data (HDR video data)of a high dynamic range (HDR) image. The video data has a level range of0 to 100%*N such as 0 to 400% or 0 to 800%. Here, a level of 100%corresponds to a luminance value 100 cd/m² of white.

The photoelectric conversion unit 103 performs the photoelectricconversion on the HDR video data obtained by the camera 102 inpredetermined units, for example, in units of scenes or in units ofprograms by selectively applying the electro-optical conversioncharacteristic according to the image content, and generates thetransmission video data. Here, the photoelectric conversioncharacteristic to be applied may be selected automatically based onanalysis of the image content or manually by an operation of the user.In this case, for example, when the input video data of thephotoelectric conversion unit 103 is indicated by 12 or more bits, thetransmission video data that has undergone the photoelectric conversionis indicated by 10 or less bits.

FIG. 3 illustrates an example of the photoelectric conversioncharacteristic. A curve of “HDR: Type 1” has a compatibility with agamma characteristic of a legacy from 0 to S1. A curve of “HDR: Type 2”has a compatibility with the gamma characteristic of the legacy from 0to S2. A curve of “HDR: Type 3” has a compatibility with the gammacharacteristic of the legacy from 0 to S3. The photoelectric conversioncharacteristics that can be selected by the photoelectric conversionunit 103 are not limited to the three characteristics.

Referring back to FIG. 2, the video encoder 104 encodes the transmissionvideo data generated by the photoelectric conversion unit 103, forexample, according to MPEG4-AVC, MPEG 2 video, or high efficiency videocoding (HEVC), and obtains encoded video data. The video encoder 104generates a video stream (a video elementary stream) including theencoded video data through a stream formatter (not illustrated) arrangedat a subsequent stage.

At this time, the video encoder 104 inserts the information of theelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data into the layer of the video stream.Generally, the electro-optical conversion characteristic informationindicates the inverse characteristic of the photoelectric conversioncharacteristic applied by the photoelectric conversion unit 103 but maynot be necessarily a perfectly inverse characteristic. For example, theelectro-optical conversion characteristic information is the typeinformation designating the type of the electro-optical conversioncharacteristic or the parameter for obtaining the curve of theelectro-optical conversion characteristic. The video encoder 104 insertsthe electro-optical conversion characteristic information, for example,in units of group of pictures (GOPs) serving as a display access unitincluding a predicted image.

The system encoder 105 generates the transport stream TS including thevideo stream generated by the video encoder 104. Then, the transmissionunit 106 transmits the transport stream TS to the set-up box 200 throughthe broadcast wave or the network packet.

At this time, the system encoder 105 inserts the information of theelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data into the layer of the transport stream(container), similarly to the insertion into the layer of the videostream. In this case, the system encoder 105 inserts the electro-opticalconversion characteristic information, for example, to be under a videoelementary loop (Video ES loop) of a program map table (PMT) included inthe transport stream TS.

An operation of the transmission device 100 illustrated in FIG. 2 willbe briefly described. The video data (the HDR video data) of the HDRimage obtained by the imaging of the camera 102 is supplied to thephotoelectric conversion unit 103. The photoelectric conversion unit 103performs the photoelectric conversion on the HDR video data inpredetermined units, for example, in units of scenes or in units ofprograms by selectively applying the electro-optical conversioncharacteristic according to the image content, and generates thetransmission video data.

The transmission video data generated by the photoelectric conversionunit 103 as described above is supplied to the video encoder 104. Thevideo encoder 104 encodes the transmission video data, for example,according to the HEVC, and generates the video stream (the videoelementary stream) including the encoded video data. At this time, thevideo encoder 104 inserts the information of the electro-opticalconversion characteristic of each predetermined unit of the transmissionvideo data into the layer of the video stream.

The video stream generated by the video encoder 104 is supplied to thesystem encoder 105. The system encoder 105 generates the transportstream TS of MPEG 2 including the video stream. At this time, the systemencoder 105 inserts the information of the electro-optical conversioncharacteristic of each predetermined unit of the transmission video datainto the layer of the transport stream (container), similarly to theinsertion into the layer of the video stream. The transmission unit 106transmits the transport stream TS to the set top box 200 through thebroadcast wave or the network packet.

[Electro-Optical Conversion Characteristic Information and TSConfiguration]

As described above, the electro-optical conversion characteristicinformation is inserted into the layer of the video stream. For example,when the encoding scheme is the HEVC, the electro-optical conversioncharacteristic information is inserted into a portion of “SEIs” of anaccess unit (AU) as an HDR EOTF information SEI message(HDR_EOTF_information SEI message).

FIG. 4 illustrates a first access unit of a group of picture (GOP) whenthe encoding scheme is the HEVC. In the case of the encoding scheme ofthe HEVC, an SEI message group “Prefix_SEIs” for decoding is arrangedahead of slices including encoded pixel data, and an SEI message group“Suffix_SEIs” for display is arranged behind the slices. The HDR EOTFinformation SEI message is arranged as the SEI message group“Suffix_SEIs.”

FIG. 5(a) illustrates an exemplary structure (syntax) of“HDR_EOTF_information SEI message.” “uuid_iso_iec_11578” has a UUIDvalue described in “ISO/IEC 11578:1996 AnnexA.” “HDR_ECTF information()” is inserted into a field of “user_data_payload_byte.” FIG. 5(b)illustrates an exemplary structure (syntax) of “HDR_EOTF information (),” and “HDR_EOTF_information_data( )” serving as the electro-opticalconversion characteristic information is inserted into “HDR_EOTFinformation( ).” “userdata_id” is an identifier of the electro-opticalconversion characteristic information indicated by 16 bits with no sign.An 8-bit field of “HDR_EOTF_information_length” indicates a byte lengthof “HDR_EOTF_information_data( )” after this field.

FIG. 6 illustrates an exemplary structure (syntax) of theelectro-optical conversion characteristic information “HDR_EOTFinformation_data( ).” FIG. 7 illustrates content (semantics) of theinformation in the exemplary structure illustrated in FIG. 6. A 16-bitfield of “uncompressed_peak_level” is a percentage value (a relativevalue when 100 cd/m² is set as 100%) of a maximum level of source imagedata (the HDR video data). “eotf_flag” is a 1-bit flag information andindicates whether or not the electro-optical conversion characteristicinformation is the type information. “1” indicates that theelectro-optical conversion characteristic information is the typeinformation designating the type of the electro-optical conversioncharacteristic. “0” indicates that the electro-optical conversioncharacteristic information is the parameter for obtaining the curve ofthe electro-optical conversion characteristic.

There is an 8-bit field of “eotf_type” when “eotf_flag=1.” Thus fieldindicates the type of the electro-optical conversion characteristic. Onthe other hand, when “eotf_flag=0,” there is the following information.A 16-bit field of “compressed_peak_level” indicates a percentage value(a relative value to 100 cd/m²) of a maximum level of encoded image data(the transmission video data). An 8-bit field of“number_of_mapping_periods” indicates the number of linked level mappingcurves.

A 16-bit field of “compressed_mapping_level” indicates a change positionof the level mapping curve at a level compression axis using apercentage value in which “compressed_peak_level” is set to 100%. A16-bit field of “uncompressed_mapping_level” indicates a change positionof the level mapping curve at a level uncompression axis using apercentage value in which “uncompressed_peak_level” is set to 100%.

As described above, the electro-optical conversion characteristicinformation is inserted into the layer of the transport stream. In thisembodiment, an HDR descriptor serving as a descriptor including theelectro-optical conversion characteristic information is inserted, forexample, to be under the program map table (PMT).

FIG. 8 illustrates an exemplary structure (syntax) of the HDRdescriptor. Although a detailed description is omitted, the sameinformation as the electro-optical conversion characteristic information“HDR_EOTF information_data( )” in the HDR EOTF information SEI messageis included in the HDR descriptor. An 8-bit field of “HDR descriptortag” indicates a descriptor type and indicates that the descriptor isthe HDR descriptor here. An 8-bit field of “HDR descriptor length”indicates a length (size) of the descriptor, that is, indicates thenumber of subsequent bytes as the length of the descriptor.

FIG. 9 illustrates an exemplary configuration of the transport streamTS. A PES packet “PID1: video PES1” of the video elementary stream isincluded in the transport stream TS. The HDR EOTF information SEImessage (HDR_EOTF_information SEI message) is inserted into the videoelementary stream.

The transport stream TS includes the program map table (PMT) as programspecific information (PSI). The PSI is information describing a programassociated with each elementary stream included in the transport stream.The transport stream TS includes an event information table (EIT)serving as serviced information (SI) for managing an event (program)unit.

The PMT includes an elementary loop having information associated witheach elementary stream. In this exemplary configuration, a videoelementary loop (Video ES loop) is included. Information such as astream type and a packet identifier (PID) and a descriptor describinginformation associated with the video elementary stream are arranged inthe video elementary loop in association with the video elementarystream. The HDR descriptor is arranged under the video elementary loop(Video ES loop) of the PMT.

[Configuration of Set-Up Box]

FIG. 10 illustrates an exemplary configuration of the set top box 200.The set top box 200 includes a control unit 201, a reception unit 202, asystem decoder 203, a video decoder 204, a high-definition multimediainterface (HDMI) transmission unit 205, and an HDMI terminal 206. The“HDMI” is a registered trademark.

The control unit 201 is equipped with a central processing unit (CPU),and controls operations of the respective units of the set top box 200based on a control program stored in a storage (not illustrated).

The reception unit 202 receives the transport stream TS transmitted fromthe transmission device 100 through the broadcast wave or the networkpacket. The system decoder 203 extracts the video stream (the elementarystream) from the transport stream TS. The system decoder 203 extractsvarious information inserted into the layer of the transport stream TSas described above, and transfers the extracted information to thecontrol unit 201. The information also includes the HDR descriptor withthe electro-optical conversion characteristic information.

The video decoder 204 performs a decoding process on the video streamextracted by the system decoder 203, and acquires the transmission videodata (baseband video data). The video decoder 204 extracts an SEImessage inserted into the video stream, and transfers the extracted SEImessage to the control unit 201. The SEI message includes the HDR EOTFinformation SEI message with the electro-optical conversioncharacteristic information.

The HDMI transmission unit 205 transmits the transmission video dataacquired by the video decoder 204 to an HDMI sink device, that is, thedisplay device 300 in this embodiment through the HDMI terminal 206using communication complying with the HDMI. The HDMI transmission unit205 transmits the electro-optical conversion characteristic informationof each predetermined unit (for example, a scene unit, a program unit,or the like) of the transmission video data given from the control unit201 to the display device 300 in association with the transmission videodata.

In this case, for example, the electro-optical conversion characteristicinformation is inserted into the blanking period of the transmissionvideo data and transmitted in association with the transmission videodata. A transmission method of the electro-optical conversioncharacteristic information is not limited to the method of inserting itinto the blanking period as described above. For example, transmissionusing a CEC line or an HDMI Ethernet channel (HEC) is also considered.

When the electro-optical conversion characteristic information isinserted into the blanking period of the transmission video data andtransmitted, a method of using an information packet arranged in theblanking period of the image data, for example, HDMI Vendor SpecificInfoFrame (VS_Info) is considered.

FIG. 11 illustrates an exemplary packet structure of the HDMI VendorSpecific InfoFrame. The HDMI Vendor Specific InfoFrame is defined inCEA-861-D, and thus a detailed description thereof is omitted. Theexemplary packet structure of FIG. 11 illustrates an example in whichthe electro-optical conversion characteristic information is the typeinformation designating the type of the electro-optical conversioncharacteristic.

Flag information “Hdr_INFOFLAG” indicating whether or not theelectro-optical conversion characteristic information is inserted isarranged in a 0th bit of a 5th byte (PBS). When the electro-opticalconversion characteristic information is inserted, “Hdr_INFOFLAG=1” isset. Flag information “Eotf_flag” indicating whether or not theelectro-optical conversion characteristic information is the typeinformation is arranged in a 3rd bit of a 7th byte (PB7). In the case ofthe example of FIG. 11, “Eotf_flag=1” is set to indicate that theelectro-optical conversion characteristic information is the typeinformation.

When the electro-optical conversion characteristic information is thetype information as described above, 16-bit information of“uncompressed_peak_level” is arranged in an 8th byte (PB8) and a 9thbyte (PB9). In this case, upper 8 bits are arranged in the 8th byte, andlower 8 bits are arranged in the 9th byte. Further, 8-bit information of“eotf_type” is arranged in a 10th byte (PB10).

FIG. 12 illustrates an exemplary packet structure of the HDMI VendorSpecific InfoFrame. The exemplary packet structure of FIG. 12illustrates an example in which the electro-optical conversioncharacteristic information is the parameter for obtaining the curve ofthe electro-optical conversion characteristic. In the case of thisexample, “Eotf_flag=0” is set to indicate that the electro-opticalconversion characteristic information is the parameter.

When the electro-optical conversion characteristic information is theparameter as described above, 16-bit information of“uncompressed_peak_level” is arranged in an 8th byte (PB8) and a 9thbyte (P89). In this case, upper 8 bits are arranged in the 8th byte, andlower 8 bits are arranged in the 9th byte. 16-bit information of“compressed_peak_level” is arranged in a 10th byte (PB10) and an 11thbyte (PB11). In this case, upper 8 bits are arranged in the 10th byte,and lower 8 bits are arranged in the 11th byte.

8-bit information of “number_of_mapping_periods” is arranged in a 12thbyte (PB12). 16-bit information of “compressed_mapping_level” isarranged in a 13th byte (PB13) and a 14th byte (PB14). In this case,upper 8 bits are arranged in the 13th byte, and lower 8 bits arearranged in the 14th byte. 16-bit information of“uncompressed_mapping_level” is arranged in a 15th byte (PB15) and a16th byte (PB16). In this case, upper 8 bits are arranged in the 15thbyte, and lower 8 bits are arranged in the 16th byte. Subsequently, thesame informationas that in the 13th to 16th bytes is arranged repeatedlyby “number_of_mapping_periods.”

[Configuration of Display Device]

FIG. 13 illustrates an exemplary configuration of the display device300. The display device 300 includes a control unit 301, an HDMIterminal 302, an HDMI reception unit 303, an electro-optical conversionunit 304, and a display unit 305. The control unit 301 is equipped witha central processing unit (CPU), and controls operations of therespective units of the display device 300 based on a control programstored in a storage (not illustrated).

The HDMI reception unit 303 receives the transmission video data and theelectro-optical conversion characteristic information of eachpredetermined unit (for example, a scene unit, a program unit, or thelike) of the transmission video data through the HDMI terminal 302 froman HDMI source device, that is, the set top box 200 in this embodimentusing communication complying with the HDMI. The HDMI reception unit 303transfers the received electro-optical conversion characteristicinformation to the control unit 301.

The electro-optical conversion unit 304 performs the electro-opticalconversion on the transmission video data received by the HDMI receptionunit 303 based on the information of the electro-optical conversioncharacteristic of each predetermined unit given from the control unit301, and obtains the output video data. The display unit 305 displaysthe HDR image based on the output video data. In this case, for example,when the input video data of the electro-optical conversion unit 304 isindicated by 10 or less bits, the output video data of theelectro-optical conversion unit 304 is indicated by 12 or more bits.

When the electro-optical conversion characteristic information is thetype information, the electro-optical conversion unit 304 performs theelectro-optical conversion on the transmission video data based on thecurve of the electro-optical conversion characteristic of the typedesignated by the type information. FIG. 14 illustrates an example ofthe electro-optical conversion characteristic. A curve of “HDR: Type 1”has a compatibility with the gamma characteristic of the legacy from 0to V1. A curve of “HDR: Type 2” has a compatibility with the gammacharacteristic of the legacy from 0 to V2. A curve of “HDR: Type 3” hasa compatibility with the gamma characteristic of the legacy from 0 toV3. The photoelectric conversion characteristics that can be selected bythe electro-optical conversion unit 304 are not limited to the threecharacteristics.

Further, when the information of the electro-optical conversioncharacteristic is the parameter for obtaining the curve of theelectro-optical conversion characteristic, the electro-opticalconversion unit 304 performs the electro-optical conversion on thetransmission video data based on the curve of the electro-opticalconversion characteristic obtained by the parameter. In this case, sincecoordinates data of a change position of the linked level mapping curveis given as the parameter, the curve of the electro-optical conversioncharacteristic is obtained to pass through a coordinate position thereofor a position adjacent thereto. Then, the electro-optical conversionunit 304 performs the electro-optical conversion based on the curve ofthe electro-optical conversion characteristic.

When the curve of the electro-optical conversion characteristic isobtained using the parameter as described above, by obtaining the curveof the electro-optical conversion characteristic based on the parameterand the maximum display level information, it is possible to limit themaximum level of the output video data to the maximum display levelinformation. FIG. 15 illustrates an example of the electro-opticalconversion characteristic. Both a curve of “HDR: Type 1” and a curve of“HDR: Type 1′” have a compatibility with the gamma characteristic of thelegacy from 0 to V1, and a maximum level of the curve of “HDR: Type 1”is S′w, whereas a maximum level of the curve of “HDR: Type 1′” islimited to S′w2 serving as a maximum display level.

Both a curve of “HDR: Type 2” and a curve of “HDR: Type 2′” have acompatibility with the gamma characteristic of the legacy from 0 to V2,and a maximum level of the curve of “HDR: Type 2” is S′w, whereas amaximum level of the curve of “HDR: Type 2′” is limited to S′w2 servingas the maximum display level. Both a curve of “HDR: Type 3” and a curveof “HDR: Type 3′” have a compatibility with the gamma characteristic ofthe legacy from 0 to V3, and a maximum level of the curve of “HDR: Type3” is S′w, whereas a maximum level of the curve of “HDR: Type 3′” islimited to S′w2 serving as the maximum display level.

An operation of the display device 300 illustrated in FIG. 13 will bebriefly described. The HDMI reception unit 303 receives the transmissionvideo data and the electro-optical conversion characteristic informationof each predetermined unit (for example, a scene unit, a program unit,or the like) of the transmission video data from the set top box 200through the HDMI terminal 302. The electro-optical conversioncharacteristic information is transferred to the control unit 301. Thetransmission video data is supplied to the electro-optical conversionunit 304.

The electro-optical conversion unit 304 performs the electro-opticalconversion based on the information of the electro-optical conversioncharacteristic of each predetermined unit given from the control-unit301, and obtains the output video data. In this case, when theelectro-optical conversion characteristic information is the typeinformation, the electro-optical conversion is performed on thetransmission video data based on the curve of the electro-opticalconversion characteristic of the type designated by the typeinformation. In this case, when the optical conversion characteristicinformation is the parameter for obtaining the curve of theelectro-optical conversion characteristic, the electro-opticalconversion is performed on the transmission video data based on thecurve of the electro-optical conversion characteristic obtained by theparameter.

The transmission video data obtained by the electro-optical conversionunit 304 is supplied to the display unit 305. The HDR image based on theoutput video data is displayed on the display unit 305.

As described above, in the transceiving system 10 illustrated in FIG. 1,the transmission device 100 inserts the information of theelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data into the layer of the video stream and thelayer of the container. Thus, it is possible to perform thephotoelectric conversion on the HDR video data in predetermined units byselectively the appropriate photoelectric conversion characteristicaccording to the image content and transmit the resulting data.

Further, in the transceiving system 10 illustrated in FIG. 1, thedisplay device 300 performs the electro-optical conversion on thetransmission video data received from the set top box 200 based on theinformation of the electro-optical conversion characteristic of eachpredetermined unit of the transmission video data, and obtains theoutput video data. Thus, it is possible to reproduce the HDR video datathat does not undergo the photoelectric conversion in the transmissiondevice 100 and displays the HDR image excellently.

Further, in the transceiving system 10 illustrated in FIG. 1, when theelectro-optical conversion characteristic information is the parameterfor obtaining the curve of the electro-optical conversioncharacteristic, the display device 300 can obtain the curve of theelectro-optical conversion characteristic based on the parameter and themaximum display level information and limit the maximum level of theoutput video data received from the electro-optical conversion unit 304to the maximum display level information. Thus, it is possible todisplay the HDR image excellently without incurring white collapse andthe like in the display unit (display) 305.

Further, in the transceiving system 10 illustrated in FIG. 1, the settop box 200 inserts the electro-optical conversion characteristicinformation of each predetermined unit of the transmission video datainto the blanking period of the transmission video data, and transmitsthe resulting data to the display device 300. Thus, it is possible toeasily transmit the electro-optical conversion characteristicinformation in association with the transmission video data.

2. MODIFIED EXAMPLE

The above embodiment has been described in connection with the examplein which the electro-optical conversion characteristic information isinserted into the layer of the video stream and the layer of thetransport stream (container), but the electro-optical conversioncharacteristic information may be inserted into any one of the layer ofthe video stream and the layer of the transport stream (container).Further, a series of percentage values are dealt as a relative value toa reference when the brightness 100 cd/m² is set as 100%, but therelative value may not be necessarily fixed thereto. 100% of thereference may be set to brightness other than 100 cd/m². In this case,an association between a value of cd/m2 and a percentage is separatelynecessary.

In the above embodiment, the transceiving system 10 is configured withthe transmission device 100, the set top box 200, and the display device300. However, a transceiving system 10A is also considered to beconfigured with a transmission device 100 and a reception device 200Aequipped with a display unit as illustrated in FIG. 16.

FIG. 17 illustrates an exemplary configuration of the reception device200A. In FIG. 17, components corresponding to those in FIGS. 10 and 13are denoted by the same reference numerals, and a detailed descriptionthereof will be appropriately omitted. The reception device 200Aincludes a control unit 201A, a reception unit 202, a system decoder203, a video decoder 204, an electro-optical conversion unit 304, and adisplay unit 305. The electro-optical conversion unit 304 performs theelectro-optical conversion on the transmission video data obtained bythe video decoder 204 based on the information of the electro-opticalconversion characteristic of each predetermined unit given from thecontrol unit 201A, and obtains the output video data. The display unit305 displays the HDR image based on the output video data.

In the above embodiment, the set top box 200 and the display device 300are connected by the HDMI digital interface. However, even when the settop box 200 and the display device 300 are connected by a digitalinterface (which includes a wireless interface as well as a wiredinterface) similar to the HDMI digital interface, the present technologycan be similarly applied.

[MPEG-DASH-Based Transceiving System]

The present technology can be also applied to an MPEG-DASH-basedtransceiving system. FIG. 18 illustrates an exemplary configuration ofan MPEG-DASH-based transceiving system 10B. The transceiving system 10Bis configured such that N receivers 403 are connected to a DASH streamfile server 401 and a DASH MPD server 402 via a network 404 such as theInternet.

The DASH stream file server 401 generates a stream segment (hereinafter,referred to appropriately as a “DASH segment”) of a DASH specificationbased on media data (video data, audio data, subtitle data, or the like)of predetermined content, and transmits a segment of a predeterminedstream to the receiver 403 of a request source according to a requestmade from the receiver 403.

The DASH MPD server 402 generates an MPD file for acquiring the DASHsegment generated in the DASH stream file server 401. The DASH MPDserver 402 generates the MPD file based on content metadata receivedfrom a content management server (not illustrated) and an address (url)of the segment generated in the DASH stream file server 401. The DASHMPD server 402 transmits the MPD file to the receiver 403 of the requestsource according to the request made from the receiver 403.

In an MPD format, an adaptation set describing encoding-relatedinformation of video or an audio is defined for each stream of video oran audio, and each attribute is described thereunder. For example, whenvideo data included in the DASH segment corresponds to encoded data ofthe transmission video data in the above embodiment, and is dataobtained by performing the photoelectric conversion on the HDR videodata in predetermined units (for example, in units of scenes or in unitsof programs) by selectively applying the photoelectric conversioncharacteristic according to the image content, the information of theelectro-optical conversion characteristic corresponding to thephotoelectric conversion characteristic is described in the MPD file. Itcorresponds to the insertion of the HDR descriptor into the layer of thetransport stream TS in the above embodiment.

In this case, the information of the electro-optical conversioncharacteristic of each predetermined unit of the video data is insertedinto the video data (the video stream) included in the DASH segment,similarly to the video stream in the above embodiment. For example, whenthe encoding scheme is the HEVC, the electro-optical conversioncharacteristic information is inserted into the portion of “SEIs” of theaccess unit (AU) as the HDR EOTF information SEI message(HDR_EOTF_information SEI message).

For example, a schema illustrated in FIG. 19 is newly defined in the MPDfile to describe the electro-optical conversion characteristicinformation. “service_video:high_dynamic_range” indicates a videodisplay is the high dynamic range (HDR). “0” indicates that the videodisplay is not the HDR, and “1” the video display is the HDR.

“service_video:high_dynamic_range:eotf_compatible” indicates whether ornot the electro-optical conversion characteristic has a compatibilitywith the gamma characteristic of the legacy. “0” indicates an HDRelectro-optical conversion characteristic having a partial compatibilitywith the gamma characteristic of the legacy. “1” indicates an HDRelectro-optical conversion characteristic having no compatibility withthe gamma characteristic of the legacy. “2” indicates that it is thegamma characteristic of the legacy.

“service_video:high_dynamic_range:eotf_type” indicates a type ofelectro-optical conversion characteristic. “0” indicates “type_1,” “1”indicates “type_2,” and “2” indicates “type_3.”“service_video:high_dynamic_range:compressed_peak_level” indicates apercentage value (a relative value when 100 cd//m2 is set, for example,as 100%) of the maximum level of the encoded image data (thetransmission video data).“service_video:high_dynamic_range:number_of_mapping_periods” indicatesthe number of linked level mapping curves.

In “service_video:high_dynamic_range:compressed_mapping_level,” thechange position of the level mapping curve at the level compression axisis indicated by a percentage value in which “compressed_peak_level” isset to 100*. In“service_video:high_dynamic_range:uncompressed_mapping_level,” thechange position of the level mapping curve at the level uncompressionaxis is indicated by a percentage value in which“uncompressed_peak_level” is set to 100%.

FIG. 20 illustrates an exemplary description of the MPD f ile includingthe electro-optical conversion characteristic information. For example,the video display is understood to be the high dynamic range (HDR) froma describing of “service_video:high_dynamic_range<1>.” For example, itis understood to be the HDR electro-optical conversion characteristichaving a compatibility with the gamma characteristic of the legacy froma description of “service_video:high_dynamic_range<0>.” For example, thetype of the electro-optical conversion characteristic is understood tobe “type_2” from a description of“service_video:high_dynamic_range:eotf_type<1>.”

FIG. 21 illustrates an exemplary configuration of a fragmented MP4stream. A fragmented MP4 stream of video includes Fragmented MP4obtained by packetizing a video stream. A predetermined picture of thevideo stream is inserted into a portion of “mdat” of Fragmented MP4.Similarly to the above embodiment, for example, the HDR EOTF informationSEI message (HDR_EOTF_information SEI message) is inserted into thevideo stream for each GOP.

Similarly to the above embodiment, the receiver 403 performs theelectro-optical conversion on the received video data based on theelectro-optical conversion characteristic information included in theHDR EOTF information SEI message or the electro-optical conversioncharacteristic information described in the MPD file. Thus, for example,it is possible to reproduce the HDR video data that does not undergo thephotoelectric conversion at the transmission side and displays the HDRimage excellently. Since the receiver 403 acquires the MPD file inadvance, the receiver 403 can prepare characteristics of theelectro-optical conversion unit in advance based on the electro-opticalconversion characteristic information included in the MPD file as well.

The transceiving system 10B illustrated in FIG. 18 transmits a segmentof a predetermined stream generated by the DASH stream file server 401or the MPD file generated by the DASH MPD server 402 to the receiver 403via the network 404. However, as illustrated in FIG. 22, it is similarlypossible to configure a transceiving system 10C in which a segment of apredetermined stream generated by the DASH stream file server 401 or theMPD file generated by the DASH MPD server 402 is transmitted from abroadcasting station 405 to the receiver 403 through a broadcast wave.

The present technology may have the following configuration.

(1)

A transmission device, including:

a processing unit that performs photoelectric conversion on input videodata having a level range of 0% to 100%*N (N is a number larger than 1),and obtains transmission video data;

a transmission unit that transmits a container including a video streamobtained by encoding the transmission video data; and

an information insertion unit that inserts information of anelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data into a layer of the video stream and/or alayer of the container.

(2)

The transmission device according to (1),

wherein the predetermined unit is a scene unit or a program unit.

(3)

The transmission device according to (1) or (2),

wherein the electro-optical conversion characteristic information istype information designating a type of the electro-optical conversioncharacteristic.

(4)

The transmission device according to (1) or (2),

wherein the electro-optical conversion characteristic information is aparameter for obtaining a curve of the electro-optical conversioncharacteristic.

(5)

A transmission method, including:

a processing step of performing photoelectric conversion on input videodata having a level range of 0% to 100%*N (N is a number larger than 1)and obtaining transmission video data;

a transmission step of transmitting, by a transmission unit, a containerincluding a video stream obtained by encoding the transmission videodata; and

an information insertion step of inserting information of anelectro-optical conversion characteristic of each predetermined unit ofthe transmission video data into a layer of the video stream and/or alayer of the container.

(6)

A reception device, including:

a reception unit that receives a container of a predetermined formatincluding a video stream obtained by encoding transmission video data,

the transmission video data being obtained by performing photoelectricconversion on input video data having a level range of 0% to 100%*N (Nis a number larger than 1),

information of an electro-optical conversion characteristic of eachpredetermined unit of the transmission video data being inserted into alayer of the video stream and/or a layer of the container; and

a processing unit that processes the video stream included in thecontainer received by the reception unit.

(7)

The reception device according to (6),

wherein the processing unit includes

a decoding unit that decodes the video stream and obtains thetransmission video data, and

an electro-optical conversion unit that performs electro-opticalconversion on the transmission video data obtained by the decoding unitbased on information of the electro-optical conversion characteristic ofeach predetermined unit, and obtains output video data.

(8)

The reception device according to (7),

wherein the electro-optical conversion characteristic information istype information designating a type of the electro-optical conversioncharacteristic, and

the electro-optical conversion unit performs electro-optical conversionon the transmission video data based on a curve of the electro-opticalconversion characteristic of the type designated by the typeinformation.

(9)

The reception device according to (7),

wherein the electro-optical conversion characteristic information is aparameter for obtaining a curve of the electro-optical conversioncharacteristic, and

the electro-optical conversion unit performs electro-optical conversionon the transmission video data based on the curve of the electro-opticalconversion characteristic obtained by the parameter.

(10)

The reception device according to (9),

wherein the curve of the electro-optical conversion characteristic usedby the electro-optical conversion unit is obtained based on theparameter and maximum display level information, and

a maximum level of the output video data is limited to the maximumdisplay level information.

(11)

The reception device according to (6),

wherein the processing unit includes

a decoding unit that decodes the video stream included in the container,and obtains the transmission video data, and

a transmission unit that transmits the transmission video data obtainedby the decoding unit and the electro-optical conversion characteristicinformation of each predetermined unit of the transmission video data toan external device in association with each other.

(12)

The reception device according to (11),

wherein the transmission unit transmits the transmission video data tothe external device through a differential signal using a predeterminednumber of channels, and inserts information of the electro-opticalconversion characteristic into a blanking period of the transmissionvideo data and transmits the electro-optical conversion characteristicinformation to the external device.

(13)

A reception method, including:

a reception step of receiving, by a reception unit, a container of apredetermined format including a video stream obtained by encodingtransmission video data,

the transmission video data being obtained by performing photoelectricconversion on input video data having a level range of 0% to 100%*N (Nis a number larger than 1),

information of an electro-optical conversion characteristic of eachpredetermined unit of the transmission video data being inserted into alayer of the video stream and/or a layer of the container; and

a processing step of processing the video stream included in thecontainer received in the reception step.

(14)

A display device, including:

a reception unit that receives transmission video data and informationof an electro-optical conversion characteristic of each predeterminedunit of the transmission video data associated with the transmissionvideo data from an external device; and

an electro-optical conversion unit that performs electro-opticalconversion on the transmission video data received by the reception unitbased on the information of the electro-optical conversioncharacteristic of each predetermined unit, and obtains output videodata.

(15)

The display device according to (14),

wherein the electro-optical conversion characteristic information istype information designating a type of the electro-optical conversioncharacteristic, and

the electro-optical conversion unit performs electro-optical conversionon the transmission video data based on a curve of the electro-opticalconversion characteristic of the type designated by the typeinformation.

(16)

The display device according to (14),

wherein the electro-optical conversion characteristic information is aparameter for obtaining a curve of the electro-optical conversioncharacteristic, and

the electro-optical conversion unit performs electro-optical conversionon the transmission video data based on the curve of the electro-opticalconversion characteristic obtained by the parameter.

(17)

The display device according to (16),

wherein the curve of the electro-optical conversion characteristic usedby the electro-optical conversion unit is obtained based on theparameter and maximum display level information, and

a maximum level of the output video data is limited to the maximumdisplay level information.

(18)

A display method, including:

a reception step of receiving, by a reception unit, transmission videodata and information of an electro-optical conversion characteristic ofeach predetermined unit of the transmission video data associated withthe transmission video data from an external device; and

an electro-optical conversion step of performing electro-opticalconversion on the transmission video data received in the reception stepbased on the information of the electro-optical conversioncharacteristic of each predetermined unit and obtaining output videodata.

(19)

A transmission device, including:

a first transmission unit that transmits a container including a videostream including encoded data of transmission video data obtained byperforming photoelectric conversion on input video data having a levelrange of 0% to 100%*N (N is a number larger than 1); and

a second transmission unit that transmits a metafile includinginformation for enabling a reception side to acquire the video stream,

wherein information of an electro-optical conversion characteristic ofeach predetermined unit of the transmission video data is inserted intothe video stream and/or the metafile.

(20)

A transmission device, including;

a transmission unit that transmits a container including a video streamincluding encoded data of transmission video data obtained by performingphotoelectric conversion on input video data having a level range of 0%to 100%*N (N is a number larger than 1),

wherein information of an electro-optical conversion characteristic ofeach predetermined unit of the transmission video data is inserted intoa layer of the video stream and/or a layer of the container.

One of main features of the present technology lies in that informationof an electro-optical conversion characteristic of each predeterminedunit of transmission video data is inserted into a layer of a videostream or a layer of a container, and thus a transmission side canperform photoelectric conversion on HDR video data in predeterminedunits by selectively applying an appropriate photoelectric conversioncharacteristic according to image content (see FIG. 9).

REFERENCE SIGNS LIST

-   10, 10A to 10C Transceiving system-   100 Transmission device-   101 Control unit-   102 Camera-   103 Photoelectric conversion unit-   104 Video encoder-   105 System encoder-   106 Transmission unit-   200 Set lop box-   200A Reception device-   201, 201A Control unit-   202 Reception unit-   203 System decoder-   204 Video decoder-   205 HDMI transmission unit-   206 HDMI terminal-   300 Display device-   301 Control unit-   302 HDMI terminal-   303 HDMI reception unit-   304 Electro-optical conversion unit-   305 Display unit-   401 DASH stream file server-   402 DASH MPD server-   403 Receiver-   404 Network-   405 Broadcasting station

1. A reception device, comprising: a high definition multimediainterface configured to receive first video data of a first high dynamicrange video and first characteristic information for an electro-opticalconversion of the first video data, the first video data received by thehigh definition multimedia interface being uncompressed, the first videodata being obtained by applying a photoelectric conversioncharacteristic to first high dynamic range video input data, the firstcharacteristic information indicating a type for the electro-opticalconversion of the first video data that corresponds to a high dynamicrange curve, the high dynamic range curve including a first segment of anon-high dynamic range gamma curve and a second segment that divergesfrom the non-high dynamic range gamma curve; reception circuitryconfigured to receive second video data of a second high dynamic rangevideo and second characteristic information for electro-opticalconversion of the second video data, the second video data received bythe reception circuitry being compressed; a video decoder configured todecode the compressed second video data received by the receptioncircuitry; electro-optical conversion circuitry configured to convertthe first video data based on the first characteristic information andthe second video data based on the second characteristic information;and a display configured to display HDR images based on the convertedfirst video data and the converted second video data.
 2. The receptiondevice according to claim 1, wherein the electro-optical conversioncircuitry is configured to convert the first video data based on thefirst characteristic information when the high definition multimediainterface receives the first video data, and convert the second videodata based on the second characteristic information when the receptioncircuitry receives the second video data; and the display is configuredto display the HDR images based on the converted first video data whenthe high definition multimedia interface receives the first video data,and display the HDR images based on the converted second video data whenthe reception circuitry receives the second video data.
 3. The receptiondevice according to claim 1, wherein the second video data is obtainedby applying a photoelectric conversion characteristic to second highdynamic range video input data, the second characteristic informationindicating a type for the electro-optical conversion of the second videodata that corresponds to the high dynamic range curve.
 4. A receptiondevice, comprising: circuitry configured to receive first video data ofa first high dynamic range video and first characteristic informationfor an electro-optical conversion of the first video data via a highdefinition multimedia interface, the first video data received via thehigh definition multimedia interface being uncompressed, the first videodata being obtained by applying a photoelectric conversioncharacteristic to first high dynamic range video input data, the firstcharacteristic information indicating a type for the electro-opticalconversion of the first video data that corresponds to a high dynamicrange curve, the high dynamic range curve including a first segment of anon-high dynamic range gamma curve and a second segment that divergesfrom the non-high dynamic range gamma curve; receive second video dataof a second high dynamic range video and second characteristicinformation for electro-optical conversion of the second video data viareception circuitry, the second video data received via the receptioncircuitry being compressed; and process the first video data based onthe first characteristic information and the second video data based onthe second characteristic information.
 5. The reception device accordingto claim 4, wherein the circuitry is configured to process the firstvideo data based on the first characteristic information when the firstvideo data is received via the high definition multimedia interface, andprocess the second video data based on the second characteristicinformation when the second video data is received via the receptioncircuitry.
 6. The reception device according to claim 4, wherein thesecond video data is obtained by applying a photoelectric conversioncharacteristic to second high dynamic range video input data, the secondcharacteristic information indicating a type for the electro-opticalconversion of the second video data that corresponds to the high dynamicrange curve.
 7. The reception device according to claim 4, wherein thenon-high dynamic range gamma curve corresponds to a standard dynamicrange.
 8. The reception device according to claim 4, wherein thecircuitry is configured to convert the first video data based on thetype for the electro-optical conversion of the first video data.
 9. Thereception device according to claim 7, wherein the circuitry isconfigured to convert the first video data based on the type for theelectro-optical conversion of the first video data.
 10. The receptiondevice according to claim 4, wherein the reception device furthercomprises the high definition multimedia interface.
 11. The receptiondevice according to claim 4, wherein the reception device furthercomprises the reception circuitry.
 12. The reception device according toclaim 4, wherein the reception device further comprises a displayconfigured to display HDR images based on the processed first video dataand the processed second video data.
 13. A reception device, comprising:a high definition multimedia interface; reception circuitry; andprocessing circuitry configured to receive video data of a high dynamicrange video and characteristic information for an electro-opticalconversion of the video data via one of the high definition multimediainterface and the reception circuitry, the video data being obtained byapplying a photoelectric conversion characteristic to high dynamic rangevideo input data, the characteristic information including a type forthe electro-optical conversion that corresponds to a high dynamic rangecurve, the high dynamic range curve including a first segment of anon-high dynamic range gamma curve and a second segment that divergesfrom the non-high dynamic range gamma curve, and process the receivedvideo data based on the characteristic information.
 14. The receptiondevice according to claim 13, wherein the processing circuitry receivesthe video data of the high dynamic range video and the characteristicinformation for the electro-optical conversion of the video data via thehigh definition multimedia interface, and the video data received by thehigh definition multimedia interface is uncompressed.
 15. The receptiondevice according to claim 13, wherein the processing circuitry receivesthe video data of the high dynamic range video and the characteristicinformation for the electro-optical conversion of the video data via thereception circuitry, and the video data received by the receptioncircuitry is compressed.
 16. The reception device according to claim 13,wherein the video data is uncompressed when the video data is receivedvia the high definition multimedia interface; and the video data iscompressed when the video data is received via the reception circuitry.